基于PIC16F946的CO气体检测仪

介绍了一种便携式CO气体检测仪的开发,论述了仪器的硬件原理图、一氧化碳气体传感器的参数模型分析以及软件的程序流程图,该仪器可实现检测空气中CO的含量,并可自动进行声、光以及震动报警,可通过按键设定二级报警值,并且可以对仪器进行标定,仪器以美国microchip公司的微控制器PIC16F946作为核心控制单元,分辨率为lppm;误差为士3%,采用3V的锂电池可以连续工作9000h以上,可广泛用于工业生产、环保、汽车、家庭等一氧化碳泄漏和不完全燃烧的检测报警.     

低温热水地板辐射采暖的发展优势及尚存问题

低温热水地板辐射采暖系统具有节约能源、减少环境污染、热舒适性好、卫生保健、初投资不高、维修费用低等优点,但在应用中尚存在一些问题,本文指出了其在设计和施工中存在的一些问题及相应的解决方法,同时通过对共约2000m^2实铺面积的统计,得出了不同管间距时单位面积大约所需的管长,根据经验提出了一种设计穹孽謦方孽虿母可哆使设计者节省设计时间,还可以避免管材浪费现象,节省工程成本。     

石墨烯基导热薄膜的研究进展

随着现代技术的发展,散热和导热已成为制约芯片器件小型化和大功率制造业发展的关键问题之一。由于传统的金属导热材料存在密度大和易氧化等问题,近年来以石墨烯基材料为代表的非金属碳基材料逐渐成为国内外的研究热点。本文综述了近年国内外石墨烯导热薄膜的制备方法及最新研究成果,分析讨论了热处理工艺、晶粒尺寸、薄膜密度及杂质原子和缺陷等对石墨烯导热薄膜性能的影响和物理机理,并对该领域的发展趋势进行了展望。     

超高层框架核心筒结构预应力施工技术及经济效益

以一幢超高层框架核心筒结构建筑为例,介绍了预应力施工方法和技术措施,并对产生的经济效益进行了估算。     

紫都·上海晶园别墅开放式石材幕墙的外墙防水措施

低层别墅单体面积较小,外立面变化却颇多。因此,石材幕墙外墙防水就要从构造入手,辅以排防水技术措施,以保工程质量。     

用变频器改善电动行车起重特性的探讨

对门式和桥式起重机采用凸轮开关切换线绕转子中串接的电阻来控制速度时,易发生桥架"抖动"问题展开研究,认为为了改善电动机械特性和控制性能,较好的办法就是选用变频器进行控制。介绍了变频器的工作原理的控制方法。     

A Comprehensive Identification and Function Analysis of Serine/Arginine-Rich (SR) Proteins in Cotton (Gossypium spp.)

As one of the most important factors in alternative splicing (AS) events, serine/arginine-rich (SR) proteins not only participate in the growth and development of plants but also play pivotal roles in abiotic stresses. However, the research about SR proteins in cotton is still lacking. In this study, we performed an extensive comparative analysis of SR proteins and determined their phylogeny in the plant lineage. A total of 169 SR family members were identified from four Gossypium species, and these genes could be divided into eight distinct subfamilies. The domain, motif distribution and gene structure of cotton SR proteins are conserved within each subfamily. The expansion of SR genes is mainly contributed by WGD and allopolyploidization events in cotton. The selection pressure analysis showed that all the paralogous gene pairs were under purifying selection pressure. Many cis-elements responding to abiotic stress and phytohormones were identified in the upstream sequences of the GhSR genes. Expression profiling suggested that some GhSR genes may involve in the pathways of plant resistance to abiotic stresses. The WGCNA analysis showed that GhSCL-8 co-expressed with many abiotic responding related genes in a salt-responding network. The Y2H assays showed that GhSCL-8 could interact with GhSRs in other subfamilies. The subcellular location analysis showed that GhSCL-8 is expressed in the nucleus. The further VIGS assays showed that the silencing of GhSCL-8 could decrease salt tolerance in cotton. These results expand our knowledge of the evolution of the SR gene family in plants, and they will also contribute to the elucidation of the biological functions of SR genes in the future.     

Recent Advances in Application of Computer-Aided Drug Design in Anti-Influenza A Virus Drug Discovery

Influenza A is an acute respiratory infectious disease caused by the influenza A virus, which seriously threatens global human health and causes substantial economic losses every year. With the emergence of new viral strains, anti-influenza drugs remain the most effective treatment for influenza A. Research on traditional, innovative small-molecule drugs faces many challenges, while computer-aided drug design (CADD) offers opportunities for the rapid and effective development of innovative drugs. This literature review describes the general process of CADD, the viral proteins that play an essential role in the life cycle of the influenza A virus and can be used as therapeutic targets for anti-influenza drugs, and examples of drug screening of viral target proteins by applying the CADD approach. Finally, the main limitations of current CADD strategies in anti-influenza drug discovery and the field’s future directions are discussed.